As you describe might work, but the blocks would have to be well aft to get any tension on the foot of the sail. Thusly rigged, the sheet parts would surely chafe on the mast horribly. I've spent loads of time thinking on this, and the only sigle-sheet stays'l solutions I can think of involve either a club or a foredecktrack (preferably curved).
If there's some other great practical solution, I'd too love to hear of it!
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